6th grade Math

I need some help figuring out how to work the word problem below. It says in 2000, the population of the United States was 280 million people. Between 1990 and 2000, the population grew by about 12%. What was the US population in 1990? The answer choices are (A) 250 million, (B) 33.6 million, (C) 313.6 million, and (D) 268 million. Thanks..

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